Learn the basics of the Database mirroring in SQL Server 2008. Mak provides a step-by-step on how to create database mirroring. Subsequent installments will discuss how to add data on the principal server and how data is mirrored to the mirrored server.
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Question: If the principal fails while running in high performance mode, what options do I have for bringing the mirror online? This question was sent to me via email. My reply follows. Quick question on DB mirroring client redirection after Principal fails
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Question: Can a 2008 SQL instance be used as the witness for a 2005 database mirroring setup? This question was sent to me via email. My reply follows. Can a 2008 SQL instance be used as the witness for a 2005 database mirroring setup? Databases to be mirrored are currently running on 2005 SQL instances but will be upgraded to 2008 SQL in the near future.
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One of the configuration options for Database Mirroring is the High Availability mode. With this option three servers are put in place the principal, mirror and witness servers. This is the only option that allows for automatic failover. One of the things that I have noticed is that when there are periodic network issues a failover occurs even though there are no issues with the Principal server. Are there any options to delay the failover?
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Database Mirroring was released with SQL Server 2005 and is becoming a popular choice for a failover solution. One of the big issues with Database Mirroring is that the failover is tied to one database, so if there is a database failure the mirrored server takes over for this one database, but all other databases remain functional on the primary server.
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If you have configured database mirroring in synchronous with or without automatic failover mode, you can switch to the mirror server instance and make it available to the clients while you perform hardware or software maintenance on the principal server instance. So let’s see how we can do this:
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